LT1307 Single Cell Micropower 600kHz PWM DC/DC Converters

The LT™1307/LT1307B are micropower, fixed frequency DC/DC converters that operate from an input voltage as low as 1V. First in the industry to achieve true current mode PWM performance from a single cell supply, the LT1307 features automatic shifting to power saving Burst Mode operation at light loads. High efficiency is maintained over a broad 100µA to 100mA load range. The LT1307B does not shift into Burst Mode operation at light loads, eliminating low frequency output ripple at the expense of light load efficiency. The devices contain a low-battery detector with a 200mV reference and shut down to less than 5µA. No load quiescent current of the LT1307 is 50µA and the internal NPN power switch handles a 500mA current with a voltage drop of just 295mV.

Unlike competitive devices, large electrolytic capacitors are not required with the LT1307/LT1307B in single cell applications. The high frequency (600kHz) switching allows the use of tiny surface mount multilayer ceramic (MLC) capacitors along with small surface mount inductors. The devices work with just 10µF of output capacitance and require only 1µF of input bypassing.

The LT1307/LT1307B are available in 8-lead MSOP, PDIP and SO packages

产品特点 Features

Uses Small Ceramic Capacitors
50µA Quiescent Current (LT1307)
1mA Quiescent Current (LT1307B)
Operates with VIN as Low as 1V
600kHz Fixed Frequency Operation
Starts into Full Load
Low Shutdown Current: 3µA
Low-Battery Detector
3.3V at 75mA from a Single Cell
Automatic Burst Mode® Operation at Light Load (LT1307)
Continuous Switching at Light Load (LT1307B)
Low VCESAT Switch: 295mV at 500mA

参数

应用

Pagers
Cordless Telephones
GPS Receivers
Battery Backup
Portable Electronic Equipment
Glucose Meters
Diagnostic Medical Instrumentation

典型应用图

LT1307 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LT1307BCMS8	MSOP	8	C	$3.15	$2.40
LT1307BCMS8#PBF	MSOP	8	C	$3.15	$2.40
LT1307BCMS8#TR	MSOP	8	C		$2.46
LT1307BCMS8#TRPBF	MSOP	8	C		$2.46
LT1307BCS8	SO	8	C	$2.75	$2.05
LT1307BCS8#PBF	SO	8	C	$2.75	$2.05
LT1307BCS8#TR	SO	8	C		$2.11
LT1307BCS8#TRPBF	SO	8	C		$2.11
LT1307BIS8	SO	8	I	$3.50	$2.60
LT1307BIS8#PBF	SO	8	I	$3.50	$2.60
LT1307BIS8#TR	SO	8	I		$2.66
LT1307BIS8#TRPBF	SO	8	I		$2.66
LT1307CMS8	MSOP	8	C	$3.15	$2.40
LT1307CMS8#PBF	MSOP	8	C	$3.15	$2.40
LT1307CMS8#TR	MSOP	8	C		$2.46
LT1307CMS8#TRPBF	MSOP	8	C		$2.46
LT1307CN8	PDIP	8	C	$2.75	$2.05
LT1307CN8#PBF	PDIP	8	C	$2.75	$2.05
LT1307CS8	SO	8	C	$2.75	$2.05
LT1307CS8#PBF	SO	8	C	$2.75	$2.05
LT1307CS8#TR	SO	8	C		$2.11
LT1307CS8#TRPBF	SO	8	C		$2.11
LT1307IS8	SO	8	I	$3.50	$2.60
LT1307IS8#PBF	SO	8	I	$3.50	$2.60

LT1307 数据手册及相关资料下载

数据手册(英文) : LT1307/LT1307B - Single Cell Micropower 600kHz PWM DC/DC Converters.PDF
应用指南 (英文) : AN67 - linear Technology Magazine Circuit Collection, Volume III.PDF
应用指南 (英文) : AN84 - linear Technology Magazine Circuit Collection, Volume IV .PDF
设计要点 (英文) : DN128 - LT1307 Single-Cell Micropower Fixed-Frequency DC/DC Converter Needs No Electrolytic Capacitors.PDF
可靠性数据 : R303 Reliability Data .PDF
LT Journal : May 2002 Small, Portable Altimeter Operates from a Single Cell.PDF